Loosen the fuel pump attaching bolts a couple of turns, and wobble the pump housing up and down an inch or so. If that produces better fuel flow, you might have camshaft problems. Also check the pressure and vacuum at the pump fittings. Will the engine run with a gravity-feed tank plumbed directly to the carburetor?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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